28228289 has 2 divisors, whose sum is σ = 28228290. Its totient is φ = 28228288.

The previous prime is 28228271. The next prime is 28228307. The reversal of 28228289 is 98282282.

It is a balanced prime because it is at equal distance from previous prime (28228271) and next prime (28228307).

It can be written as a sum of positive squares in only one way, i.e., 28143025 + 85264 = 5305^2 + 292^2 .

It is a cyclic number.

It is not a de Polignac number, because 28228289 - 2⁸ = 28228033 is a prime.

It is not a weakly prime, because it can be changed into another prime (28228229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14114144 + 14114145.

It is an arithmetic number, because the mean of its divisors is an integer number (14114145).

Almost surely, 2^28228289 is an apocalyptic number.

It is an amenable number.

28228289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28228289 is an equidigital number, since it uses as much as digits as its factorization.

28228289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 41.

The square root of 28228289 is about 5313.0301147274. The cubic root of 28228289 is about 304.4819261941.

It can be divided in two parts, 2822 and 8289, that added together give a palindrome (11111).

The spelling of 28228289 in words is "twenty-eight million, two hundred twenty-eight thousand, two hundred eighty-nine".